Sewing machine with zigzag attachment



Feb. 16, 1954 E. URSCHELER SEWING MACHINE WITH ZIGZAG ATTACHMENT 3 Sheets-Sheet 1 Filed Feb. 21, 1951 1375x704. 071). a?! CH5; 6'

1954 E. URSCHELER SEWING MACHINE WITH ZIGZAG ATTACHMENT 3 Sheets-Sheet 2 Filed Feb. 21, 1951 wa /i I 4 I 2 m N 0 Inws/vn/e i nwg uzfscl/elca Feb. I6, 1954 T URSCHELER 2,669,204

SEWING MACHINE WITH ZIGZAG ATTACHMENT Filed Feb. 21, 1951 3 Sheets-Sheet 3 K J Y INVENTOR.

27m 4'! Vrscizeler BY r 20.

Patented Feb. 16, 1954 *"SEWING MACHINE WITH ZIGZAG 1 ATTACHMENT 7 Emil Urscheler, Dietikon, Switzerland ApplicationFebrfuaryjzl, 1951, Serial No; 212,072

. 1;.Claims priority, .application:.Switzerland February 25, 1950 The-present invention relates .to a sewing machine. with zigzag attachment. particularly a. household. sewing... machine with free work sup-. porting arm, inwhich, for.performing...and sizing.

the zigzag stitch, the .needle bar is.associated with 'the slide block .of..a swinging link operated fromthe main. drive. through a governing means. .Thesewing machine. asper inVention-isessen-r. tially. characterized in that the eccentric-controlled. governing means in the form of a bifur cated lever. has. a link; directly suspended therefrom and which vcarrig-z sa part of an adjusting device, while .the.;other part thereof .is seated on'a'n and passing through thebifurcatedlever andmovablerby. an operating means accessible from outside for oscillatabilityof the link and hence for displacing the zigzag seam froma cen-- tre position at leastinone direction.

" Further features of the invention will appear.

from the specification,- claims and drawin which represents by way of example two preferred forms of embodiment incorporating the invention.

In said annexed drawing- Fig. 1 showsi'a front viewof the link pivotally arrangedon a bifurcated leven -while V .Fig.2'shows a sectional view of-.the adjusting device} Fig. 31s a view of a modified form of embodiment, corresponding to Fig. 1;

Fig. 4 is a cross-section taken on the line BB of Fig. 3;

Figs. 5-7 represent different positions of the adjusting device according to Figs. 3 and 4.

Fig. 8 is a variant of a detail.

Fig. 9 is a diagrammatic view of the connection between the bifurcated lever or the slide block with the needle bar, and

Fig. 10 is a diagrammatic view of the elements participating in the lateral displacement of the seam shown in their various positions.

With reference to the form of embodiment as shown in Figs. 1 and 2,-a bifurcated lever l is provided which receives a movement of oscillation from the main drive of the machine via an eccentric. By means of a screw connection 2 the fork is fast on a bushing 3 oscillatably arranged in supports 4 and 5 of the machine frame. At the front of the fork, a slide block 6 is pivotally swung from the fork I by pivot l. A guide element 2| is guided in the guide-way 6a of the slide block 5 and connected by a link 23 with the needle bar 21. This arrangement, which is illustrated schematically in Fig. 9, serves to carry out the zigzag stitches and the adjustment thereof, by cooperation with the slide block 6 and "guide-way 6a.

. A Team 29. on theni'ain shaft 30 moves the fork 1 together with the slide block 6 mounted thereon by. pivot 7.: The guide member 2| intheguideway 6a is connectedby a pin22 with the link 23 which is connected byshaft 24 with the guideway. 25. of theneedle bar 21. and the needleholder.

2.8thereof. The needle bar 2.1 is oscillatable laterally-aboutthe shaft 26.

.In order to displacethe zigzag seamv from its centre position inone direction, say, to the left, the following arrangement is provided.

. At its portion remote from the pivot 1 the link 6 carries a socket 6b at right angles thereto.. Said socket is engageable by the tapered end 8a of an axle 8.. passing throughthe bifurcated. lever 1 l or. itsv bushing. 3 andhaving atits other end a handle 9, say,.a..knurled knob operablefrom outside. .The axle 8 can be moved into two end positions which are .lin'iited. b.y.-av -set-screw l0 entering a groove H orthe like therein.

Attached to .the. bifurcated lever, by. means of a screw I2, is a, bracketlB: adapted to carry a guide-pin l4. forasprin v 15 which at one end bears on the bracket 13 andat thev other end on the main linklfi... The. springv l5 tends to urge the linkfi into aposition which corresponds to the amplitudeofthe zigzag seam from the centre position.v If, consequent1y,..the axle-.8 with the tapered end' ea is retracted from the socket 6b of the link 6, the latter is caused by action of the spring l5 to swing out to the left. On pushing home the knob 9, the tapered end Ba engages the countersunk socket 6b, 60, thus causing the link 6 to swing, contrary to the action of spring l5, into a position which corresponds to the centre position of the zigzag seam.

In the embodiment shown the link is only permitted to swing in one direction, whereby the zigzag seam is displaced from the centre in this direction only, preferably to the left.

In the form of embodiment according to Figs. 3-8, a displacement of the zigzag seam from the centre is possible to the left and/or to the right. Therefore the link, which in the first form is oscillatably arranged about a pivot 1 on fork l, incorporates a pin l6 instead of a socket 612, said pin being firmly seated on the link and has its axis Isa outside that 81) of the axle 8. The pin may be either cylindrically shaped as in Figs. 4-7 or be given a square or rectangular section as shown in Fig. 8. Cooperative with the pin I6 is a second link I! rigidly inserted in the axle 8, say, by screwing.

According to whether the axle 8a is rocked clockwise or anticlockwise by means of the setting knob 18, the main link 6 is caused to swing out from the centre (Fig. 6) to the left (Fig. or to the right (Fig. 7) via link I I and pin I 6.

Fig. illustrates the transmission of the oscillations of the slide block 6 to the needle bar 2'5. In conformity with the mean position of the adjustment device of Fig. 6, the pin 22 of the guide member 2| is in position I. This position corresponds to a position Id of the needle bar. r

In the position illustrated in Fig. 5 for lateral displacement to the left, the pin 22 and needle bar 21 occupy the extreme left positions II and He, while for lateral displacement to the right they occupy the positions III and HM.

The setting knob l8 carries a resilient member l9 which can fall into three notches determining the end positions as well as the centre position of the oscillatability of the axle 8 and hence of the link H. These end positions lie about 8 before the abutment of the link H in the bore Ia of fork I.

The present invention provides a zigzag seam adjusting attachment which, especially in the case of portable household sewing machines with free work supporting arm, makes possible a compact and space-saving structure insofar as the main link 6 is directly mounted on the bifurcated lever, whilst the elements of the attachment adapted to displace the seam from the centre position are directly seated on the link and an axle which passes through said lever, with setting knob accessible from outside.

What I claim is:

1. In a sewing machine, a needle bar pivoted on the machine to oscillate about a horizontal axis, a forked lever pivotally mounted on the machine remote from said needle bar and on an axis parallel to the pivot axis of said needle bar, a slide block pivotally mounted on said forked lever, a guide member slidable in said slide block, means connecting said needle bar with said guide member for oscillation therewith as the forked lever oscillates, a main drive shaft on said machine, a cam fixed on said drive shaft and engaged with said forked lever; and an adjustment means on said forked lever and engaged with said slide block, comprising an element fixed on said slide block, and a manually adjustable control member extended slidably through said forked lever and engaged with said element for holding said slide block in a desired fixed position relative to its pivotal mounting on said forked lever.

2. A sewing machine as claimed in claim 1, wherein the fixed element comprises a rectangularly oflset socket on said slide block, spring means is provided urging said slide block in one direction relative to said forked lever, and a tapered end is provided on said control member cooperating with the socket so that upon engagement of the former with the socket, said slide block is held contrary to the action of the spring in the position which corresponds to the centre position of the zigzag seam, whereas in the retracted condition of the tapered end of said control member said slide block is spring-biassed intothe deflected position.

3. A sewing machine as claimed in claim 2, wherein said spring means comprises a compression spring bearing at one end on said slide block and having its other end engaging a stationary part of said forked lever to swin said forked lever out from its centre position.

4. A sewing machine as claimed in claim 1, wherein the end of said slide block remote from its end supported for oscillation on said forked lever carries a rectangularly offset pin, a second link fast on said control member passing through said forked lever engages said offset pin, and that the axis of the slide block lies outside that of the adjustin axle. V

5. A sewing machine as claimed in claim 1, wherein the free end of said control member passing through said forked lever has an operating knob attached thereto and accessible from outside.

EMIL URSCHEIER.

References Cited in the file of this patent UNITED STATES PATENTS 

